Optical thresholder consisting of two cascaded Mach–Zehnder interferometers with nonlinear microring resonators
Optical thresholder consisting of two cascaded Mach–Zehnder interferometers with nonlinear microring resonators
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由两个级联的马赫-曾德干涉仪和非线性微环谐振器组成的光学阈值器
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发表时间：
2017
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通讯作者：
S. Talabattula
中科院分区：
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作者：
H. Kishikawa;T. Kondo;N. Goto;S. Talabattula
我们提出了一种光学阈值器，在低电平和高电平输出中都具有平坦的功率传递函数。光学阈值器由两个级联的马赫-曾德干涉仪组成，每个干涉仪中都有一个非线性微环谐振器。从理论上分析了硅波导阈值器的功率传递函数和响应速度。在环形半径为5 μ m的条件下，得到了一个阈值为7 mW、响应速度为13 GHz的阈值器，在环形半径相同的条件下，通过调整器件参数，以提高阈值22 mW为代价，将响应速度提高到23.7 GHz。进一步提高响应频率可以通过减小环半径来实现。环形半径为2 μ m的阈值显示响应频率为40.5 GHz。(C) 2017年中国光学仪器工程师学会（SPIE）
We propose an optical thresholder having a flat power transfer function both in low-and high-level outputs. The optical thresholder consists of two cascaded Mach-Zehnder interferometers (MZIs) with a nonlinear microring resonator in each MZI. We theoretically analyze the power transfer function and the response speed of the thresholder made of silicon waveguides. A thresholder having the threshold of 7 mW with a response speed of 13 GHz was obtained with a ring radius of 5 mu m. The response speed can be increased to 23.7 GHz by adjusting device parameters with the same ring radius at the cost of increased threshold of 22 mW. Further increased response frequency can be realized by reducing the ring radius. A thresholder with a ring radius of 2 mu m shows the response frequency of 40.5 GHz. (C) 2017 Society of Photo-Optical Instrumentation Engineers (SPIE)